206 



to the other. The clifFerences are given in a detailed manner by 

 Mr. Riley (4 Rep., p. Ill) upon comparing numerous specimens in 

 conjunction with Mr. Cresson. I was fortunate enough to be able 

 to compare a considerable number of types, and I am largely in- 

 debted to Mr. S. I. Smith for most of them, and notes concerning 

 Mr. Cresson's views. I believe Mr. Riley is right in supposing that 

 Say inadvertently overlooked the white apical spot on abdomen of 

 C. nuncius, and since the same happened to Dr. Packard in the 

 description of his species, I should add that among the more than 

 two hundred specimens bred by myself, all, both male and female, 

 possess the Avhite apical spot, though it varies in the male. I saw 

 no male bred from Promethea, without a white spot, but there are 

 recorded some found by Mr. Riley. The color of the tarsi I observed 

 to be a little more variable than stated by Mr. Riley, having bred a 

 male C. nuncius Avith all the joints of the tarsi black above, and 

 some males and females with the first joint entirely blackish. The 

 very apparent white color of the four anterior coxae of the male, and 

 the short ovipositor of the female, are the most prominent characters. 



It is an interesting fact, that between the large number of Cr. 

 nuncius bred by Mr. Smith from Polyphemus, not one male possesses 

 a white apical spot on the abdomen. I have thirty-six males and 

 females before me, and am not able to find any other difference be- 

 tween them and the parasites from Promethea. 



The other species, Cr. extrematis,* is described by Mr. Cresson 

 (Sept. 1864, Proc. Ent. Soc. Philad., p. 304), and as Cr. Samiae by 

 Dr. Packard (March, 1865, Proc. Bost. S. N. 11., p. 346). The iden- 

 tity of both species, presumed by Mr. Riley (Rep. IV, p. Ill), is now 

 proved by numerous types before me. There were some difficulties 

 to be overcome before I was able to be sure of my determination. 

 That the male described as C. extrematis belongs to C. nuncius was 

 recognized by Messrs. Cresson and Riley (Rep. IV, p. 110), but there 

 were some discrepancies in Dr. Packard's description of Cr. Samiae 

 pointed out by Mr. Riley, the misapplication of the terms "trochan- 

 ters" for " coxae," and " coxae" for " trochanters," and the omission 

 to mention the white apical spot of the abdomen of the female. As 

 I have before me about twenty types of C. Samiae, together with 

 the types with Dr. Packard's original label, all belonging to the 



* The name C. extrematis is not admissible on :ucoiint of its incorrec formation. 



